Oh, Serena, I'm sorry for your situation. I don't know the details but I'm wishing the best for you.
When I got divorced, one thing I did that made me feel great for awhile was to buy a really girly comforter and sheets. I found some on clearance because, frankly, I was broke--but it made me feel so much better. My ex had always bought these really ugly geometric patterned comforters with dark colors--I hated that. You might try to replace something that you never liked.
I also went through a situation in January where my DD (13) decided to stay with her dad in NM after Christmas vacation. She had some problems with girls in school and her dad made her feel guilty so she decided to stay and I decided to let her try it. She just came home in May to stay (hooray!) but it broke my heart at the time. I was so depressed because my dad had just died the year before and I'm still not really over that. One thing that helped was to write in a journal. I wanted to say some hurtful things that I really couldn't say to DD or to anyone else. Just temper tantrum, pity party stuff that I wasn't comfortable telling anyone. It helped to get it out of my system--then I was able to see what I needed to do and just carry on until she came back.
I hope some of this is helpful to you, Serena. My very best wishes to you.